Speed. Hardest one I've done so far. Warmup (1.5 miles), then 5 x 1K at 6:22min miles (5K pace - 9.4mph) at 1% incline, with 400m jog recoveries. I nearly didn't finish this workout. Jog recoveries, instead of walking, really made it a lot harder, even though the jogs themselves were really slow (10min/miles). Happy that I completed it....just.
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